Dental impression tray



B. F. SAHR DENTAL IMPRESSION TRAY Fild July 10. 1926 Patented May 17, 1927.

f BENJAMIN F. satin, or avw maso gmaa sbm DENTAL IMPREssIoN TRAY. 7

Application filed Jnly 10,

, My invention relates to dental impression trays and, morev particularly, to dental 11npression traysof the type used for low-eraw lmpressions, and the nvention is directedto? 5 an lmprovedequallzer for suchtrays;

the U-shaped trays used for lower impressions, because there has not been available at a point centrally of the U-shaped tray a pressure device or service adapted to be engagedby a finger or thumb of the hand used 2 to manipulate thetray. My invention pro-.

vides such a device in connection with the U-shaped trays used for lower jaw impresslons'. r

7. Dentists are required to have on hand a large number of these U-shaped trays, varying in size and shape for difierent sizes and forms, of mouths.

Hence, as an important feature. I provide an adjustable pressure bar adapted to be adjusted and quickly applied 9 to any one of the several different trays.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views. 7 r

Referring to the drawings:

Fig. 1 is a plan view illustrating an ad just-able pressure bar applied to a tray adapted for lower jaw impressions:

Fig. 2 is a side elevation of the parts shown in Fig. 1; I r Fig. 3 ]S a transverse section on'the line 3 3 of Fig. 1; r

Fig. 4 is a plan view corresponding to Fig. 1 but illustrating a modified form in (which the pressurelbar'is formed integral with the tray Fig. 5 is a view corresponding to Fig. 1 and illustrating a modified form of the devicezand v Fig. 6 is a section taken on the line 66 of Fig. 5, some parts being in full.

Describing first the construction illustrated in Figs. 1, 2 and 3, the numeral 5 indi cates a tray adaptedfor lower jaw impressions and provided with the customaI'V handle 6. The pressure bar here illustrated "is made up oftwdsubstantially flat; pressed metal sections 7 having overlapped: ends formed-wlthslots 8.-- Tl1e outer ends of the sections 7 are rigidlybut detachably secured to (the back of the tray .by smallnue equipped bolts 9 having heads countersunk into the tray. The nmnerallO indicatessmall concave fingerpiece or cup having a threaded stem passed through the coincident slots Sand equipped with a nut 11, which, when tightened, clamps the overlapped ends of the bar sections 7 together and against a 'shoulder'12 formed at the bottom of the cup.

This fingerpiece will be adjusted so that it will be at the center of the tray and so that when a finger of the handused'to grip the handle'6 is pressed-against the same, the pressureput on opposite sides {of the tray will be equalized. Obviously,'the pressure bar 7 is made longitudinally adjustable sothatit'willfit onto trays-that vary a great deal in'width. j c I This detachable and adjustable pressure bar is especially adapted for application" to In the manufacture of trays already made; new trays for-lower jaw impressions, the

pressure bar may be castintegralwith the V tray, Such structureisshown in Fig. 4, wherein the pressure bar 13 is cast integralwith the tray 5 and is formed'with a con': cavecup or fingerpiece 14: located at'the 7 center of thetray and in line with the tray i handle 6*. i

In thec construction illustratedin Figs. 5

to I 1 and6, the pressure bar 15 is made of a single piece of flat metal raised at its central por- 1 tion and provided atits ends with slots 16 through which'and perforations inv the tray 5,nut-'equipped bolts '17 are passed to rigid 1y but detachably secure said bar to said tray. The fingerpiece 18 has a threaded 1' stem 19 passed through a central perforation in the pressure bar 15 and'equipped with a nut 20. This bridge bar is not only detachable, but its slots 16 permit it to be i applied to traysof 'diflerent sizesand widths.- a j The use of this pressure baras a pressureequalizing means makes it an easy matter to make the best kind of impressions and great- 1 ly improves the technique of dentists using the same.

The efliciencv and desirability of the device has been demonstrated in practice.

What Iclaimis: 1. A dental impression tray for lower jaw impressions-having one-piece a U-shaped H Y i 'bodyand a projecting handle; and provided s With alrigidly held transverse pressure bar verse center of the tray formed with a fingerpiece at the transverse centerof the tray for equalizing the pressure on the two sides of the tray. 7 I 2. A one-piece 'U-shaped dental impression tray adapted for lowerjaw impressions and provided with a pro ecting handle, in

V 3. The combination 'With a U-shaped; dental "impression trayadapted for lower tions and providedwith a nut foradjustably I clamping sald fingerpiece to the 'overl'appedf endsof said pressure bar, said; fingerp-l-e'eej tray.

jaw impressions and provided With a handle projecting centrally therefrom, of a longitudinally adjustable pressure bar made up of overlapped sections havingslots in their overlapped ends, nut equipped bolts detachably securing; the ends of said bar sections to the back of the tray, and a concave fingerpiece having a stem Working through the slots in the overlapped ends of said bar'secbeing located at the transverse'center of said In testimony whereof I affix my signature.

BENJAMIN Ft SAHR-i 

